40-phase cycling of the second and the third pulses in 3-pulse z-filter 5Q-MAS of I = 5/2




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Z-filter 5Q-MAS with 40-phase cycling

Two approaches:
(1) filtering the coherences,
(2) explicit phase cycling the pulses and the receiver,
are used for the simulation of echo and antiecho amplitude in 5Q-MAS of spin I = 5/2 system. The sequence consists of two strong amplitude pulses followed by a weak amplitude pulse.

(1) 40-phase cycling the second and the third pulses

φ1 = 0
φ2 = 0 36 72 108 144 180 216 252 288 324
φ3 = {0}X10  {90}X10  {180}X10  {270}X10
φrec = {0 180}X5   {90 270}X5    {180 0}X5   {270 90}X5

This 40-phase cycling selects the three families of coherence transfer pathways:

  1. 0Q -> -1Q -> +4Q -> -1Q,
  2. 0Q -> +1Q -> -4Q -> -1Q,
  3. 0Q -> 5Q -> +0Q -> -1Q (the desired coherence transfer pathways),

as shown in the following figure. Family a is yellow pathway, family b is brown pathway, and family c is red pathways:

coherence transfer pathways for I = 5/2 in 5Q z-filter sequence with soft pulse

(2) Simulation

We provide SIMPSON2 Tcl scripts for simulating the echo and antiecho amplitude versus a pulse duration:
(1) filtering the coherences (a Tcl script is associated with each family),
(2) 40-phase cycling the pulses and the receiver.

Duration Filtering 40-phase cycling
1st-pulse
  1. al-40p2p3-filt-p1a
  2. al-40p2p3-filt-p1b
  3. al-40p2p3-filt-p1c

a + b + c: total-p1
al-p2p3-cycl-p1
2nd-pulse
  1. al-40p2p3-filt-p2a
  2. al-40p2p3-filt-p2b
  3. al-40p2p3-filt-p2c

a + b + c: total-p2
al-p2p3-cycl-p2
3rd-pulse
  1. al-p2p3-filt-p3a
  2. al-p2p3-filt-p3b
  3. al-p2p3-filt-p3c

a + b + c: total-p3
al-p2p3-cycl-p3
 

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[Contact me] - Last updated December 15, 2012
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